1,3

N. L. Biggs et al., Graph Theory 1736-1936, Oxford, 1976, p. 62 (quoting Cayley, who is wrong).

A. Cayley, On the mathematical theory of isomers, Phil. Mag. vol. 67 (1874), 444-447 (a(6) is wrong).

Sequence in context: A007374 A105207 A133802 this_sequence A114398 A107326 A018671

Adjacent sequences: A076199 A076200 A076201 this_sequence A076203 A076204 A076205

dead